/**
 * Created by asusluo on 2017-08-30.
 */
(function () {
    var datepicker = {};

    datepicker.getMonthData = function (year, month) {

        var ret = [];
        if (!year || !month){
            var today = new Date();
            year = today.getFullYear();
            month = today.getMonth() + 1;
        }

        var firstDay = new Date(year, month -1,1);
        var firstDayWeekDay = firstDay.getDay();
        if(firstDayWeekDay === 0) firstDayWeekDay = 7;


        year = firstDay.getFullYear();
        month = firstDay.getMonth() + 1;

        var lastDayOfLastMonth = new Date(year,month -1,0);
        var lastDateOfLastMonth = lastDayOfLastMonth.getDate();

        var preMonthDayCount = firstDayWeekDay -1;

        var lastDay = new Date(year,month,0);
        var lastDate = lastDay.getDate();

        for(var i=0;i<7*6;i++){
            var date = i + 1 - preMonthDayCount;
            var showDate = date;
            var thisMonth = month;
            if(date <= 0){
                //上一月
                thisMonth = month -1;
                showDate = lastDateOfLastMonth + date;
            }else if(date > lastDate){
                //下一月
                thisMonth = month +1;
                showDate = showDate -lastDate;
            }

            if(thisMonth === 0) thisMonth = 12;
            if(thisMonth ===13) thisMonth = 1;

            ret.push({
                month:thisMonth,
                date:date,
                showDate:showDate
            });
        }

        return {
            year:year,
            month:month,
            days:ret
        };

    };

    window.datepicker = datepicker;
})();